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Analyse de la robustesse d'une composition de frigorigènes mixtes utilisés dans le processus GNL (gaz naturel liquéfié) de frigorigènes à un seul mélange.

Robustness analysis of the mixed refrigerant composition employed in the single mixed refrigerant (SMR) liquefied natural gas (LNG) process.

Auteurs : CAO L., LIU J., XU X.

Type d'article : Article

Résumé

The SMR system is widely used in the small- and medium-scale LNG plants. The optimization of the mixed refrigerant composition is a multi-variable, nonlinear and strong coupling issue. The optimization of the mixed refrigerant composition can reach high exergy efficiency by making the heat exchange curves match rationally. However, adjusting the mixed refrigerant composition in a practical SMR system is very complex. In this paper, the robustness of the mixed refrigerant composition was mainly investigated by optimizing the SMR system with GA and Aspen Plus. The degree of freedom in the variables was reduced to verify the robustness of the mixed refrigerant, and to ensure that the control and adjustment will be convenient and reliable. The results showed that the robustness of the mixed refrigerant composition was very strong because the exergy efficiency is maintained about 0.40, even though the ratio of the mixed refrigerant was restrained. This work discusses both the heat exchange process and the exergy loss in the recuperative heat exchanger. Meanwhile, a novel method for adjusting the mixed refrigerant is proposed to achieve a high efficiency in the SMR system.

Détails

  • Titre original : Robustness analysis of the mixed refrigerant composition employed in the single mixed refrigerant (SMR) liquefied natural gas (LNG) process.
  • Identifiant de la fiche : 30017078
  • Langues : Anglais
  • Source : Applied Thermal Engineering - vol. 93
  • Date d'édition : 25/01/2016
  • DOI : http://dx.doi.org/10.1016/j.applthermaleng.2015.10.072

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